(57) A light scanning device (23) includes a polygon mirror (4), a first incidence optical
system (5Y), a second incidence optical system (5C), a first scanning lens (6Y), and
a second scanning lens (6C). The polygon mirror (4) includes a deflection surface
(41) being adapted to ensure entering of the first light beam and the second light
beam at an identical timing. Assuming that, at a time point, at which the light beam
reflected at the deflection surface (41) passes through a position on an optical axis
of a scanning lens (6Y, 6C) in plan view of the polygon mirror (41) along an axial
direction of the rotation shaft (40), a reflection point of a light beam on the deflection
surface (41) is a reference point (P), the second scanning lens (6C) is arranged at
different positions in a main-scanning direction and in an optical axis direction
with respect to the first scanning lens (6Y), such that a circle locus (A1) is along
an offset curved line (A2). The circle locus (A1) is a locus of a point corresponding
to the reference point (P) by the rotation of the polygon mirror (4).
|
|
